关键词: 细菌纤维素, 气凝胶, 电子转移活化再生催化剂原子转移自由基聚合法, 甲基丙烯酸二甲氨乙酯

Abstract:

In order to prepare novel controllable graft-polymers from bacterial cellulose (BC) aerogels, BC grafted N,N,N',N,'N'' pentamethyldiethylenetriamine (BC-g-PDMAEMA) was synthesized by electron transfer for atom transfer radical polymerization (ARGET ATRP), using bacterial cellulose aerogels with bromide side-group (BC-Br) as the macroinitiator and N,N,N',N,'N'' -PMDETA/copper(II) bromide (CuBr2) as catalytic system, vitamin C as reducing agent and 2-(dimethylamino) ethyl methacrylate(DMAEMA) as the comonomer. Molecular weight distribution, Element content, chemical structure, thermal stability, crystalline structure and surface morphology of the modified BC aerogels were characterized by gel chromatography, energy dispersive spectrum, Fourier transform infrared spectrometry, X-ray diffraction, scanning electron microscopy and thermal gravity nanlysis. The results indicate that the BC-g-PDMAEMA polymers are successfully prepared by ARGET ATRP. The molecular weight distribution is 1.27 and the grafting rate of DMAEMA is 875.76%. After grafting, the diameter of the fiber is increased and the covering layer is formed on the fiber surface. The thermal stability of the BC-g-PDMAEMA polymers increased from 205℃ to 230℃.

Key words: bacterial cellulose, aerogel, electron transfer for atom transfer radical polymerization, 2-(dimethylamino) ethyl methacrylate